Woven-wire screen



Feb. 18, 1930. A. E. HELMAN Y 1,747,631

WOVEN WIRE SCREE N Filed June 1927 I N VEN TOR.

'1 ATTORNEYJ.

Patented Feb. 18, 1930 l UNITED STATES PATENT OFFICE TYLER COMPANY,

OF CLEVELAND, OHIO, A CORPORATION OF OHIO WOVEN-WIRE SCREEN Application filed June 9, 1927. Serial No. 197.643.

The present invention is directed to a new and improved woven wire screen characteri'zed by extreme regularity in spacing and by a complete lack of the distorted and partially cut wires found in screens which have been subjected to rolling and hammering processes after weaving. Ordinarily woven wire screen is frequently hammered or rolled to render the surface level and to flatten out 1 the so-called knuckles of the wires, and in this process the wires, which are ordinarily preliminarily crimped or bent, are opened up slightly at the knees, thus causing a release of the engagement which otherwise would be effected by the transverse wires upon the longitudinal wires, with the result that the rolling or flattening process, while benefitting the screen in one respect is a serious detriment in another and produces a screen which is loose, sleazy and very much more subject to movement of the wires out of their original position with the resultant inaccuracy of the grading of materials. In many cases the rolling of the screen distorts the mesh so much that it cannot be used at all and in almost every case some distortion is produced by roll- 1H0.

lo the accomplishment of the foregoing and related ends, said invention, then, consists of the means hereinafter fully described and particularly pointed out in the claims; the annexed drawing and the following description setting forth in detail one method and one product exemplifying my invention, such disclosed procedure and product constituting, however, but one of various applications of the principle of my invention.

' In said annexed drawings Fig. 1 is a fragmental end view showing a pair of crimping rolls with a wire passed therbetween; Fig. 2 is an enlarged detail view showing the action of the rolls on the wire; Fig. 3 is an enlarged view of the wire after the crimping treatment; Fig. 4 is a transverse sectional view of a screen woven with transverse wires treated by my improved method;'Fig. 5 is a plan View of my improved screen; Fig. 6 is a transverse sectlon view of the same on the line 66 of Flg. 5;

and Fig. 7 is a longitudinal section of a part of the screen upon the line 77 of Fig. 5.

Referring nowto Fig. 1, there are shown two cooperative rolls 1 ancl'2, which are provided with a series of teeth or corrugations 3 and 4, respectively. Between these two rolls is passed a wire 5 which, as it is engaged between the teeth, is bent into corrugated portions 6, shown at the left of Fig. 1. The rolls 1 and 2 are so spaced and the corrugating elements or ribs 3 and 4 are so proportioned in depth and in spacing from each other that as the wire is engaged between the rolls the apex 7 of each rib or tooth forces the wire against the recess 8 in the other roll corresponding in position to the tooth 7 and slightly flattens the crest 9 of the crimped portion of the wire and also the recessed surface 10 of the same portion, since the spacing between the apex of the tooth and the corresponding recess of the other roll is less than the normal thickness of the wire 5. The teeth of the rolls are spaced apart sufliciently so that the wire when crimped is not forced completely into contact aroundthe sides of the ribs or teeth, but is spaced slightly from these sides as indicated in Fig. 2. except at the crests of the corrugations, with the result that the metal intermediate the crests of the successive corrugations is not engaged by the teeth and is not worked or hardened during this action. The crests of the equidistantly spaced V-shaped corrugations which form the so-called knuckles of the woven screen are, however, worked and hardened during the bending and flattening operation. producing a much increased rigidity and strength at the intersections, that is, the interengaging points of the transverse and longitudinal wires of the final screen. In some cases only the transverse wires may be so treated, but in many cases, both transverse and longitudinal wires are preliminarily crimped and a screen formed of such wires is very much superior to one made in the former way and then rolled.

The form of the preliminary'crimped wire is shown in Fig. 3 and the finished screen in Fig. 5. In the latter view the longitudinal wires 11 are shown received within the angular recesses or knuckles 12 of the transtain the wires of both series in a predeterverse wires 5 and these longitudinal wires are mined tight engagement.

there being held without any loosening of the engagement. Frequently the wires are loosened when the woven screen is rolled by the old method to bring the knuckles into the general plane of the screen, as has already been explained. In this view are also shown the flattened crests 9 of the corrugations in the transverse and longitudinal wires.

My improved screen, or one made by my improved method hereinbefore described, is equally level and flat as screens made by previous methods, is very much more rigid and less subject to variation in the spacing between longitudinal wires and is stronger in the wires which have been .crimped because of the temper given to the knuckle portions of the corrugations by the action of the crimping rolls. A further important advantage of the present screen lies in the fact that a better screen of a materially longer life may be produced at a lower cost than that of the former screens.

Other forms may be employed embodying the features of my invention instead of the one here explained, change being made in the form or construction, provided the elements stated by any of the following claims or the equivalent of such stated elements be employed, whether produced by my preferred method or by others embodying steps equivalent to those stated in the following claims.

I therefore particularly point out and distinctly claim as my invention 1. A woven wire screen comprising longitudinal andtransverse wires, one series 0 wires having equidistantly spaced hardened knuckle portions,-said knuckle portions having fiat surfaces adapted to receive and engage therein the wires of the other series in a locked and regular relation, and with sufficient inherent resilient pressure to maintain the same in their predetermined relationship and to prevent sleaziness in use.

2. A woven wire screen comprising longitudinal and transverse wires, both series of wires having equidistantly= spaced V-shaped resilient hardened knuckle portions, ,said knuckle portions having fiat surfaces adapted to grip therein the wires of the other series in a locked engagement, the metal in the bends of said V-shaped portions retaining its resiliency and acting to maintain the predetermined tight engagement between the two sets of wires and to prevent sleaziness.

3. A woven wire screen comprising longitudinal and transverse wires, both series of wires having equidistantly spaced V-shaped resilient hardened knuckle portions adapted Signed by me, this 5th day of March, 1927. 

